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1 Working To Restore Nature There are two surface streams near the site. Mormon Slough approximately 500 feet to the southwest and the eastward extension of the Stockton Deep Water Channel (including MacLeod ' Lake) approximately 2,000 feet to the north-northwest. Both bodies of water empty into the San Joaquin River approximately 2 miles downstream from the site 1 2 Site Geology and Hydrogeology Based on information obtained from previous borings at the site, sediments underlying the site ' consist primarily of clay from ground surface to approximately 10 feet bsg From 10 feet to approximately 60 feet bsg, the sediments consist predominantly of clay, with poorly graded silty ' sand lenses varying in thickness from approximately 5 to 20 feet. The interpreted subsurface conditions are shown on Plate 3 (Geologic Cross Section A-A') and Plate 4 (Geologic Cross ' Section B-B'). The traces of the geologic cross-sections are included on PIate 2 During drilling, groundwater was encountered at approximately 37 feet bsg. From December 1988 to September 1994, static water levels have fluctuated from approximately 30 to 45 feet bsg, variations in depth to water between the wells during each monitoring event are apparently ' due to seasonal fluctuations and possible hydraulic influence caused by the Stockton Deep Water Channel which is located approximately 2,000 feet to the north. Depth to water measurements ' are shown on Table 1, Groundwater Elevation Measurements and Results of Subjective Analyses. Based onroundwater elevations measured on September 28, 1994, the direction of groundwater g P ' flow is generally toward the northeast with an approximate gradient of 0 006. The direction of groundwater flow has ranged from southeast to northeast since groundwater monitoring was ' initiated in December 1988. 38009-8138009-8 F" 4